Indicate that some edge is to be moved. For example, the
'se-resize' cursor is used when the movement starts from the
south-east corner of the box.

text

Indicates text that may be selected. Often rendered as an I-beam.

wait

Indicates that the program is busy and the user should
wait. Often rendered as a watch or hourglass.

progress

A progress indicator. The program is performing some processing,
but is different from 'wait' in that the user may still interact with the program.
Often rendered as a spinning beach ball,
or an arrow with a watch or hourglass.

help

Help is available for the object under the cursor. Often rendered
as a question mark or a balloon.

The user agent retrieves the cursor from the resource
designated by the URI. If the user agent cannot handle
the first cursor of a list of cursors, it should attempt
to handle the second, etc. If the user agent cannot handle
any user-defined cursor, it must use the generic cursor
at the end of the list.
Intrinsic sizes for cursors are calculated as for background images, except
that a UA-defined rectangle is used in place of the rectangle that
establishes the coordinate system for the 'background-image' property.
This UA-defined rectangle should be based on the size of a typical
cursor on the UA's operating system. If the resulting cursor size does
not fit within this rectangle, the UA may proportionally scale the
resulting cursor down until it fits within the rectangle.

This example sets the cursor on all hyperlinks (whether visited or not)
to an external SVG cursor.
User agents that do not support SVG cursors would simply skip to the
next value and attempt to use the "hyper.cur" cursor.
If that cursor format was also not supported, the UA would skip to the next value and simply render the 'pointer' cursor.

Note.
The System Colors are deprecated in the CSS3 Color Module [CSS3COLOR].

In addition to being able to assign pre-defined color values to text, backgrounds, etc., CSS2 introduced a set of named color values that allows authors to specify colors in a manner that integrates them into the operating system's graphic environment.

For systems that do not have a corresponding value, the
specified value should be mapped to the nearest system value, or to a default color.

The following lists additional values for color-related CSS properties and their general meaning. Any color property (e.g., 'color' or 'background-color') can take
one of the following names. Although these are case-insensitive, it is
recommended that the mixed capitalization shown below be used, to
make the names more legible.

At times, style sheet authors may want to create outlines around
visual objects such as buttons, active form fields, image maps, etc.,
to make them stand out. CSS 2.1 outlines differ from borders in the following
ways:

The outline created with the outline properties is drawn "over" a
box, i.e., the outline is always on top, and does not influence the
position or size of the box, or of any other boxes. Therefore,
displaying or suppressing outlines does not cause reflow or overflow.

Outlines may be non-rectangular. For example, if the element is
broken across several lines, the outline is the minimum outline that
encloses all the element's boxes. In contrast to borders, the outline is not
open at the line box's end or start, but is always fully connected if possible.

The 'outline-color'
accepts all colors, as well as the keyword 'invert'. 'Invert' is expected to
perform a color inversion on the pixels on the screen. This is a
common trick to ensure the focus border is visible, regardless of
color background.

Conformant UAs may ignore the 'invert' value on platforms that do not
support color inversion of the pixels on the screen. If the UA does not
support the 'invert' value then the initial value of the 'outline-color'
property is the value of the 'color' property, similar to the initial value
of the 'border-top-color' property.

Graphical user interfaces may use outlines around elements to tell
the user which element on the page has the focus. These outlines are in addition
to any borders, and switching outlines on and off should not cause
the document to reflow. The focus is the subject of user interaction
in a document (e.g., for entering text, selecting a button,
etc.). User agents supporting the interactive media group
must keep track of where the focus lies and must also represent the
focus. This may be done by using dynamic outlines in conjunction with
the :focus pseudo-class.

Example(s):

For example, to draw a thick black line around an element when it
has the focus, and a thick red line when it is active, the following
rules can be used:

The CSS working group considers that the magnification of a
document or portions of a document should not be specified through
style sheets. User agents may support such magnification in different ways
(e.g., larger images, louder sounds, etc.)

When magnifying a page, UAs should preserve the relationships
between positioned elements. For example, a comic strip may be
composed of images with overlaid text elements. When magnifying this
page, a user agent should keep the text within the comic strip balloon.